Can't re-open serial port after closing it

I've got some code that opens a serial port, uses it, and then closes it (by calling close on the file descriptor). If I try to re-open it, I get a "resource busy" error. If I quit my app and try again, it's fine. Any ideas? Thanks, Rick _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app... This email sent to site_archiver@lists.apple.com